<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        div{
            border: 1px solid rgb(255,0,0);
        }
    </style>
</head>
<body>
    <div style="height: 80px">标题栏</div>
    <div style="height: 600px;display: flex;">
        <div style="height: 595px;width: 200px;">导航栏<br>
            <a href="base.html" target="contentFrame">跳转base.html</a><br>
            <a href="1.html" target="contentFrame">跳转1.html</a><br>
            <a href="img/3.html" target="contentFrame">跳转3.html</a>
        </div>
        <iframe frameborder="0" src="1.html" name="contentFrame"
                width="1000" height="590"></iframe>
    </div>
</body>
</html>